1. AM Roller Team
Team Members
Kassia Prystalski (Team Leader)
DJ Byard(Treasurer)
Rene Teufack (Secretary)
Lauren Bushong (Member)
Advisor
Patricia Stein
Sponsor
ArcelorMittal

2. ArcelorMittal
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● ArcelorMittal is the world’s leading steel and mining company, producing 98.1
million tons of crude steel in 2014. [1]
● 222,000 employees across 60 countries, with an industrial presence in 19
countries.
● Leader in all major global steel markets including automotive, construction,
household appliances and packaging

3. Problem Statement
The cold rollers are losing surface texture 2-3 times
faster when processing TRIP 780
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Replacement rollers

4. Processing TRIP Steel
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Work
Rollers
H = 0.110’’
h = .055’’

5. 5
Conventional Steels
TRIP Steel/ Conventional
TRIP780 is green
● Outstanding combination of strength and ductility
● High strain hardening capacity; good at absorbing energy
● Developed by ArcelorMittal for Honda Motor Company

6. 6
Roll Replacement Cost Comparison
Replacing
Rolls
Conditioning
Rolls
Roll Change
Downtime
Cost
Total Cost
Mild Steel $300,000 $5,000 $1,000 $306,000
TRIP 780 2x $600,000 $10,000 $2,000 $612,000
TRIP 780 3x $900,000 $15,000 $3,000 $918,000

7. Hypothesis 1: Aluminum Oxides
IF Al₂O₃ is precipitating out of the TRIP 780 steel
THEN the Al₂O₃ is causing excessive roller wear
BECAUSE abrasive wear is caused by gouging and
material removal of softer surfaces (work rollers) by
harder particles (Al₂O₃) that protrude from the surface
of a material in contact
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8. Experimental Design
This Semester
● Literature research
● Mounting and Polishing
Samples
● Microstructure Analysis
● Qualitative Mild & TRIP
comparison
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Next Semester
● SEM elemental analysis
● Quantitative Mild &
TRIP comparison
Hot Roll Pickle Band Cold Roll

9. 9
Mounting and Polishing
Sample Prep SOP
Mount
120
500
1200
1 μm diamond
0.04 μm colloidal Si
2% nital etchant

10. Aluminum Oxides
10
600 Microns 600 Microns
Mild Steel TRIP 780

11. Hypothesis 2: Lubrication
IF the lubrication is inappropriate for the rolling
pressure
THEN it is causing excess roller wear
BECAUSE there is direct contact between the
TRIP 780 steel and the rollers
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Note: ArcelorMittal engineers considered switching
lubricant to be less cost-effective than just
replacing/refinishing worn rollers, so we are no longer
pursuing this hypothesis.

12. Team Timeline
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Next Semester Goals
- SEM elemental analysis
- Quantitative Mild & TRIP comparison
- Confirm Aluminum Oxide Presence

13. References
1. World Steel Association, Top Steel Producing Companies 2014
http://www.worldsteel.org/dms/internetDocumentList/downloads/statistics/Extended-
listing-2014/document/Extended%20listing%202014.pdf
2. World Steel Association, Transformation-Induced Plasticity Steel
http://www.worldautosteel.org/steel-basics/steel-types/transformation-induced-
plasticity-trip-steel/
3. World Steel Association, AHSS Application Guidelines V5
http://www.worldautosteel.org/steel-basics/steel-types/transformation-induced-
plasticity-trip-steel/
4. ArcelorMittal, TRIP (TRansformation Induced Plasticity) steels
http://fce.arcelormittal.com/saturnus/sheets/B_EN.pdf
5. Cold Roll Stand Graphic
http://amirkabirsteelco.ir/en/inc_cold_roll.html
1. Cleveland Ohio Facility http://usa.arcelormittal.com/Our-operations/Flat/Cleveland/
2. Repairer driven news 2016 Honda HR-V http://www.repairerdrivennews.com/2015/06/24/2016-
honda-hr-v-is-ultra-popular-and-27-percent-ultra-high-strength-steel/
8. Steel Rolling Mill Machinery www.steelrollinmillmachinery.com/cold-rolling-mills.html
9. Newcastle University Rolling Mill Tutorial
http://csd.newcastle.edu.au/simulations/roll_sim.html
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